Question

Write a note on Indian standard time and why is there a time difference of 2 hours from Arunachal Pradesh to Gujarat

Answer 1

The time of a place depends on the longitude that passes through it. Therefore, the standard time for each country is usually taken as the time of the central meridian that passes through it. ... Thus, we need a standardmeridian for the country. In India 82 ½ °E longitude determines the standard time.

Answer 2

Answer:

Two hours difference between time zones of Arunachal and Gujarat (difference of 30 Deg longitude). Each longitude has time diff of 4 min, making it 120 min or 2 hrs difference. But we have only 1 IST (Indian standard Time) unlike in US where there are multiple timezones. From Gujarat to Arunachal Pradesh there is a time lag of two hours, but the watches show the same time because the time along the Standard Meridian of India (82° 30' E) passing through Mirzapur in Uttar Pradesh is taken as the standard time for the whole country. Because the same standard time for the whole country has been adopted, the watches show the same time in Arunachal Pradesh and Gujarat and in all parts of the country.